Question: What is ceiling exposure limit for phenol which duration is 15.0?
Paraphrase: Phenol with a duration of 15.0 has what ceiling exposure limit?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q130336 p:P2405 ?s . ?s ps:P2405 ?obj . ?s pq:P2047 ?x filter(contains(?x , '15.0')) }